import {
  ADD_COUNTER,
  ADD_TO_CART
} from "@/store/mutation-types";

export default {
  addCart(context,payload){
    return new Promise((resolve,reject) =>{
      // payload是新添加的商品
      // 使用find函数对商品进行一个判断
      // 1.查找之前数组中是否有该商品
      let oldProduct = context.state.cartList.find(item => item.iid === payload.iid)
      // 2.判断oldProduct
      if(oldProduct){
        // oldProduct.count += 1
        context.commit(ADD_COUNTER,oldProduct)
        resolve('当前的商品数量+1')
      }else {
        payload.count = 1
        // state.cartList.push(payload)
        context.commit(ADD_TO_CART,payload)
        resolve('添加了新的商品')
      }
    })

  }
}
